Highest number of S-Rank Chests: Sapphire Maze of Glee lvl. 69, with 9 S-Rank Chests (if you own this map you might be the luckiest DQIX player ever). Also, 5 A-Rank Chests and Shogum as the final boss... So it's pretty good for chest farming.

Highest number of A-Rank Chests: Sapphire Nest of Bliss lvl. 65, with 13 A-Rank Chests (if you want every Metal Slime gear, try to get this map). Also, 2 S-Rank Chests and Nemean as the final boss... Another good for chest farming.

One of the best Chest Farming maps is called "Emerald World of Gloom lvl. 86", also know as Kawasaki Locker, which contains 4 S-Rank Chests and 6 A-Rank Chests. It was fastly developed via Tag Mode in Japan, along with the Masayuki Locker.

I haven't got the Sapphire Maze of Glee lvl. 69, but I've got another good map for chest farming. It's called Emerald Ruins of Dread lvl. 88. It contains 4 S-Rank Chests and another 4 A-Rank Chests, Platinum King Jewels on the last floor and Tyrannosaurus Wrecks as the final boss.

Here finishes my Treasure Map guide. And remember, if you own one of that LMS/MKS floor maps, stop training in the Bowhole or in the Slime Hill. That floor is the best place for training. And if you own one of that GS floor maps, stop killing Gold Golems: start getting fast money.

Good Grotto Hunting for everyone!

PS: I own the Gold Maze of Bane lvl. 62. What to say, it's a fine map, but LMS sometimes come with Darkonium Slimes, Octagoons and Sick Trigertaurs...